That's not an antenna. Helps you see where the curb is on the passe get side, or guide you how far you are from another car.

Also notice it's RHD.

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Right, it looks and almost acts like a power antenna (if it's the retractable version).
I noticed it in a lot of cars from Japan, albeit on the left side (opposite their driver, same side as ours), and they would then have a switch on the console labelled "POLE" to control this 'power antenna' Civic VTEC enthusiasts/ricers know this. LOL